That clunking is probably the engine mounts and/or trans mounts. They kinda suck on M103 motors, and if they've not been done yet then they are ready.

Have a friend shift from N to D while you stand to the side with the hood open and watch for engine jump. If it moves around a bunch, they're shot.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition